alleryIf the 10th term of an AP is 31 and first term is 4, common difference is
A3
B2
C4
D5
Answer & Solution
Correct answer: A. 3
1. Use a_10 = a + 9 d.
2. 31 = 4 + 9 d.
3. 9 d = 27, so d = 3.
4. Hence d = 3.
_Source: Selina Concise Mathematics Class 10, Ch on Arithmetic Progression (Mistral OCR'd PDF), section on common difference_
Keep practising Arithmetic & Geometric Progressions
Browse all Arithmetic & Geometric Progressions questions for Andhra Pradesh SSC (Class 10), or explore more Mathematics topics.
Related questions
If S_n = n^2 + 3 n, then first term and common difference areHow many three-digit numbers are divisible by 6?If sum of an AP is 100 and a = 5, l = 15, number of terms isIf a_n = 3 n + 5, the first three terms areSum of all natural numbers between 100 and 200 divisible by 7 isMiddle term of the AP 1, 5, 9, ..., 49 isSum of an AP with first term 7, last term 47 and 9 terms isIf 4th term is 11 and 9th term is 26, first term is